gstreamer/gst/spectrum/demo-audiotest.c
Stefan Kost e7cfdce6ce gst/spectrum/: added another example
Original commit message from CVS:
* gst/spectrum/Makefile.am:
* gst/spectrum/demo-audiotest.c: (on_frequency_changed),
(spectrum_chain), (main):
* gst/spectrum/demo-osssrc.c:
added another example
* sys/v4l2/gstv4l2src.c:
fix typo
2006-05-26 22:35:00 +00:00

99 lines
2.8 KiB
C

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gtk/gtk.h>
#define SPECT_BANDS 256
static GtkWidget *drawingarea = NULL;
static gint ct = 0;
static void
on_frequency_changed (GtkRange * range, gpointer user_data)
{
GstElement *machine = GST_ELEMENT (user_data);
gdouble value = gtk_range_get_value (range);
g_object_set (machine, "freq", value, NULL);
}
static void
spectrum_chain (GstElement * sink, GstBuffer * buf, GstPad * pad,
gpointer unused)
{
ct = (ct + 1) & 0x15;
if (!ct) {
gint i;
guchar *data = buf->data;
gint width = GST_BUFFER_SIZE (buf);
GdkRectangle rect = { 0, 0, width, 50 };
gdk_window_begin_paint_rect (drawingarea->window, &rect);
gdk_draw_rectangle (drawingarea->window, drawingarea->style->black_gc,
TRUE, 0, 0, width, 50);
for (i = 0; i < width; i++) {
gdk_draw_rectangle (drawingarea->window, drawingarea->style->white_gc,
TRUE, i, 64 - data[i], 1, data[i]);
}
gdk_window_end_paint (drawingarea->window);
}
}
int
main (int argc, char *argv[])
{
GstElement *bin;
GstElement *src, *spectrum, *sink;
GtkWidget *appwindow, *vbox, *widget;
gst_init (&argc, &argv);
gtk_init (&argc, &argv);
bin = gst_pipeline_new ("bin");
src = gst_element_factory_make ("audiotestsrc", "src");
g_object_set (G_OBJECT (src), "blocksize", (gulong) 1024 * 2, NULL);
spectrum = gst_element_factory_make ("spectrum", "spectrum");
g_object_set (G_OBJECT (spectrum), "width", SPECT_BANDS, "threshold", -80,
NULL);
sink = gst_element_factory_make ("fakesink", "sink");
g_object_set (G_OBJECT (sink), "signal-handoffs", TRUE, NULL);
g_signal_connect (sink, "handoff", G_CALLBACK (spectrum_chain), NULL);
gst_bin_add_many (GST_BIN (bin), src, spectrum, sink, NULL);
if (!gst_element_link_many (src, spectrum, sink, NULL)) {
fprintf (stderr, "cant link elements\n");
exit (1);
}
appwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
vbox = gtk_vbox_new (FALSE, 6);
widget = gtk_hscale_new_with_range (50.0, 20000.0, 10);
gtk_scale_set_draw_value (GTK_SCALE (widget), TRUE);
gtk_scale_set_value_pos (GTK_SCALE (widget), GTK_POS_TOP);
gtk_range_set_value (GTK_RANGE (widget), 440.0);
g_signal_connect (G_OBJECT (widget), "value-changed",
G_CALLBACK (on_frequency_changed), (gpointer) src);
gtk_container_add (GTK_CONTAINER (vbox), widget);
drawingarea = gtk_drawing_area_new ();
gtk_drawing_area_size (GTK_DRAWING_AREA (drawingarea), SPECT_BANDS, 64);
gtk_container_add (GTK_CONTAINER (vbox), drawingarea);
gtk_container_add (GTK_CONTAINER (appwindow), vbox);
gtk_widget_show_all (appwindow);
gst_element_set_state (bin, GST_STATE_PLAYING);
gtk_main ();
gst_element_set_state (bin, GST_STATE_NULL);
gst_object_unref (bin);
return 0;
}